Product Details

ABOUT OUR COMPANY

we are the top 5manufacture of precision seamless steel tube in China ,our company mainly produes various specification cold finished steel tube which are widely used in hydraulic cylinder ,automobile ,oil driling ,textil machinery ,engineering machinery ,and so on ,and we have passed ISO 900012008 verified certification ,so welcome to our company to visiting and negotiate business .

Product Description

Commodity	ASTM A519 SAE4140 Cold drawn seamless mechanical steel tube
Items	Seamless steel tube	Cold drawn/rolled tube	Honed tube
Length	According to the customer’s need
Tolerance	H8 H9,H10 or as customer’s need
Surface roughness	Ra0.2-0.8µm
Standard	Round pipe: GB/8163-2008, GB 8162-2008, ASTM A 106, DIN2391, 1 ASTMA519
Grade	Q345,10#-45#,ST35-ST52,16Mm
Application	Hydraulic cylinder, automobile, oil drilling, textile machinery,etc.
Inspection	With hydraulic testing, eddy current and infrared test.
Normal Seaworthy Packing	1. Bundle packing. 2. Beveled end or plain end or varnished as per buyer's requests. 3. Marking: as per customer's requests. 4. Painting varnish coating on the pipe. 5. Plastic caps at ends or according to your request.
Delivery Time	Less than 25days after the advanced payment
Payment Terms	T/T or L/C
Outer diameter	30-250mm
Finally condition	BK BKS BKW NBK GBK

Mechanics performance:
Material	Tensile strength	Yield strength	Elongation	Hardness
CK20/20#/AISI1020	>520 N/ mm2	>375 N/mm2	>15%	>85HB
CK45/45#/AISI1045	>600 N/ mm2	>520 N/ mm2	>15%	>85HB
ST52/16Mn/Q345D	>600 N/ mm2	>520 N/ mm2	>15%	>85HB
25Mn/STKM 13C-T	>600 N/ mm2	>530 N/ mm2	>15%	>85HB

Variety :
Processing	Cylinder Diameter	Straightness	Size Accuracy	W.T/mm	Inner Bore Roughess
Cold drawn/cold rolled	ID30-250	0.3	H9-H11	±10%	0.4~1.6um
Honed tube	ID50-250	0.3	H7-H9	±10%	<0.4um

Tolerance on ID:
No.	Inside diameter (mm)	ID machining allowance (mm)
1	300-80	0.5-0.8
2	81-125	0.7-1.1
3	125-200	0.9-1.2
4	200-250	1-1.5
Other dimension can be customize